Inking pad for stencil duplicating machines



Jan; 23, 1951 I J, DQPPELT 2,538,864

INKING PAD FOR STENCIL DUPLICATING MACHINES Filed July 26, 1947 INVENTOR.

w[V015 figppeli Patented Jan. 23, 1951 UNITED STATES... PATENT OFFICE INKING PAD FOR STENCIL DUPLICATING MACHINES Max J. Doppelt, Chicago, Ill.

..; bk-[@199 July 26, 1947, Serial No. 763,799

-- i-Claims"; (c1. a l-54.5)

' My invention relates to a laminated pad having in desirable proportions the properties of absorption, distribution, and transfer of ink to and through a stencil for delivering inkimpressions to a sheet of paper or other material which is to-receive predetermined markings. jjlhe pad of this invention is also simple and inexpensive to produce, and extremely effective for the purpose indicated. It comprises a plurality-ef plies of textile material that are marginally intercom-V nected. One outermost ply which receives the ink is an open mesh fabric and relatively non-absorbent; The ink in passing therethjrough is'distributed laterally and uniformly. The'intermediate plies are relatively absorbent gand so promote the ink transfer through the laminated pad to theopposite outermost ply 'whichfcontrols the delivery of the ink therethrough orjito the stencil surface which is utilized in effecting the desired ink impression. p

An inking pad having these special characteristics is illustrated in the accompanying drawing wherein Figure 1 shows in perspective a conventional duplicating device equipped with the laminated inking pad of this invention; v

Fig. 2 is a transverse section through the device, on an enlarged scale, taken on line :-22 of Fig. 1; Fig. 3 is a view in perspective oij -gthe laminated inking pad per se;

Fig. 4 is a fragmentary plan view-[of the inking pad with portions of the plies broken away to better exhibit its laminated construction; and

Fig. 5 is an enlarged fragmentary detail in section transversely through the platen of the duplicating device, showing theYlaminations of the present inking pad in operative association therewith.

The duplicating device which I h ave chosen for purposes of exemplification is substantially that set forth in my Patent No. 2,203,; 192 of June 4, 1940. It comprises a base B onswhich a casing C is rockably mounted, the casingbeing provided with a foraminous platen 6 which' is bowed transversely of the casing to deliver pressure successively at every portion over a paper sheet 11 which is rested upon the base B. A cap} is fitted over N a nipple 9 that upstands from the top of the casing to provide a filler opening for which is to be introduced therein. The casing is provided at each of its ends with opposedibrackets l0 affording mountings for rods ll one of which is extended lengthwise along each side of the casing.

As shown best in Figs. 3 and 4;; the laminated pad comprises a plurality of plies] of textile ma.-

terial which are interconnected by a line of stitching l5 near one end thereof. The plies of material so interconnected comprise at the top (as shown in'Figs. 3 and 4) a piece of buckram b which overlies several plies g of gauze or cheesecloth. The base ply s against which the intermediate gauze plies are rested is a fabric made of sea island cotton. Opposite ends "of the bottom ply may be turned to form loops l6 one of which is secured by the stitching line I5. The other 1001) is held by a line of stitching I1. .With the exception of the single line of stitching l5 all'the "plies may be free of each other to adjustthen'iselves fiatwise in accordance with the conditions that are encountered. t

The buckram ply b is relatively non-absorbent. This may be due to the sizing or other treatment which is a common characteristic of such a fabric. When the laminated pad is to be applied to the platen, the rods II are inserted through the loops l6 of the base ply s and then mounted in their supporting brackets It]. The pad is there by held closely against the platen with the buckram ply b in engagement therewith. This ply acts primarily to check the flow of the ink coming through the platen openings and conduct the ink laterally to effect a wide distribution thereof over the receiving face of the pad before encountering the intermediate plies g of gauze or the like.

These intermediate plies g have a high value of absorption and capillarity. The ink is absorbed through the threads of these plies and transferred from one ply to another so as to be distributed uniformly fromedge to edge. These plies of gauze rest freely against each other with capacity for working one with respect to those adjacent whenever the inking pad is subjected to pressure in the operation of impressing ink on to a paper surface through the medium of the usual stencil sheet 2|] that is carried by the casing in overlying relation to the pad. The threads which define the meshes of the gauze plies are" haphazardly positioned relative to each other, so that their positions are subject to constant change in use of the pad. The number of intermediate plies g of gauze or like absorptive material may be varied according to conditions, depending in part upontthe amount of ink retention and distribution that is "desired. Four such intermediate plies have, in actual service, proven very satisfactory.

The outermost base :ply s which is in contact with the stencil is the one that is relied upon to control the delivery;v of ink from the pad. I have found for this purpose that sea island cotgauze may both be made from cotton having an open mesh but low thread count and substan- ,7 V

tially high capillarities; however, gauze is high ly absorbent of the ink, Whereas buckram is not.

iii The delivery ply for which sea island cotton is 5* chosen has a high thread count, a. lownabsorptive capacity for ink, but an excellent power of distribution. tics noted, when combined together in the manner described, provide a padwhichserves ef- Vective-.y as a medium for the controlled transfer of ink from the face of the foraminous platen -to the paper sheet on which the ink impression tobe made. i v

.L'I claim: v

1-. ,A laminated inking pad forstcncil duplicating machines comprising multiple plies of jw'o'ventextile fabric composed of vink absorptive ,a'ndink conducting material, all marginally in terconnected, the ink-delivery .ply being of sea island cotton and the remaining plies of coarse cotton fabric having a low thread .countand-a [substantially high capillarity. 3 i 2. A laminated inking pad fora stencil duplieating machine comprising multiple plies of textileiiabric marginally;interconnected, the ink receiving ply being of" relatively -nonv labjsorloent buckr'am, the ink-delivery. ply beingv of fsea island cotton, 'andthe intermediatecplies being ofr'elativ'ely absorbentopen mesh, low thread QOfi'fit, cotton with the threads and meshes of one Several plies having the characterisa arranged haphazardly with respect to those adjacent.

3 A laminated inking pad for a stencil duplicat g machine comprising an ink-receiving ply ofnr elatively non-absorbent buckram, other plies adjacent one face thereof of relatively absorbent cotton gauze having their meshes arranged haphaz'ardly with respect to each other, and a delivery ply or'sea' island --cotton arranged upon the outermost face of the gauze plies adapted to transfer therefrom the absorbed ink contained therein to a surface whereon the ink is to be impressed.

r 4;;A'1am1nated inking pad for a stencil dupli- 'cating machine comprising a plurality of mar- 'giiially interconnected plies of woven textile delilv erstheinkhaving a high count :of threads containing relativelylong soft cotton fibers, and sthe intermediate plies being of relatively ah;-

sorbent cotton gauze haying' an open mesh, thread count wi-ththe threads and meshes of one; arransed haphazardly with respect to those adjacent, and each game ply being free to shift laterally with respect to the adjacent plies While remaining in extended contact therewith,

rammars orrnn' The following references are of record in file of this patent:

- onrrsn STATES PATENTS I number Name new" 3 1539370 Falder lamina; Jan 12, im- 1,5YZTZ.,O81- sengbusch shrill-Mari 16, 1556 1,739,191 vosburg l fies; 10; was I regents Horton Mill-h ll Mans, 199

fi6ppe1'ha.duu.a -LL- r V Janet-1940- 

